with \(\gamma >0\) . In particular, if \(\ell \in C^{1{},{}1}_{{L_\ell }}\)  and \(\gamma < {2}{L_\ell }\) , then all accumulation points of (REF ), \(u^\star \) , are fixed points of \(T_\gamma \)  called \(\gamma \) -critical points, that is [1]}
\(u^\star = T_\gamma (u^\star ).\) 
